Models-3 represents the U.S. EPA's first tangible product to evolve
out of the community modeling paradigm. Thus, as there is now a
framework for a community model in Models-3, the CMAS is a centralized
coordination of efforts for mutual benefit to scientists, model
developers, practitioners of modeling, and regulatory users of modeled
results. Currently, the following activities are available through
the CMAS: on-line help desk, model downloads, training courses,
conferences, model development assistance, model documentation,
and model-related research.

Combining advances in the sciences of atmospheric dispersion modeling,
geographical information management, communications, and computer
hardware, the Computer-Assisted Protective Action Recommendation
System (CAPARS) is a state-of-the-art capability, operating off
a UNIX workstation, for predicting the path and impacts from an
atmospheric release of hazardous materials. This paper, presented
in July 1997 by Alpha Trac, describes a case study of the Regional
Atmospheric Response Center in Denver, Colorado.

This site, provided by the Internet Journal of Urban Climate,
gives a list of over 30 air dispersion models (and other related
models) used in Germany and elsewhere in Europe. Each model listing
includes a description of the model and how to contact each model
developer/distributor.

Atmospheric dispersion models have been developed and applied
at the Finnish Meteorological Institute since the early 1970's.
This site addresses both urban air quality and regional and long-range
transport. More specifically, detailed information on several international
and national urban air quality projects is given along with examples
of models. Additionally, information on the HILATAR model for regional
and long-range transport is given.

This page contains a database of 27 different air dispersion models.
Each model entry includes: a description, software availability,
the original authors, literature references, and validation studies
pertaining to the model. The GAIA website is sponsored by a consortium
of 10 countries in Europe, Africa, Asia and Latin America and maintained
through the European Commission.

As part of their Urban Air Quality Management (UAQM) Programme,
the International Petroleum Industry Environmental Conservation
Association (IPIECA) has developed a PC-based emission inventory
model, known as the IPIECA Toolkit. The Toolkit allows policy makers
and planners to build an accurate and comprehensive emissions inventory
upon which to assess the cost-effectiveness of alternative measures
to reduce emissions.

The document link discusses the principles behind emission inventories
and describes the emission inventory model, IPIECA Toolkit. The
Toolkit is currently freely available to non-profit making organizations.
For information on access to the model, please visit the group's
website at http://www.ipieca.org/index.html.

The U.S. Department of Commerce and National Oceanic and Atmospheric
Administration produced a report in 1999 with an in-depth compilation
and description of atmospheric transport and dispersion models.
The intended audience is people with consequence assessment responsibilities
(i.e., for assessing hazardous materials releases).

This website is a source of information on atmospheric dispersion
(air quality) models that support regulatory programs required by
the Clean Air Act. Documentation and guidance for these computerized
models are a major feature of this website. The computer code, data
and technical documents offered herein deal with mathematical modeling
for the dispersion of air pollutants.